# US 2014/0155259 A1 · Superabsorbent polymer having a capacity increase

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- Number: US 2014/0155259 A1
- Document ID: US20140155259A1
- Status: Published application
- Kind: A1
- Application number: 14/161,962
- Filed: 2014-01-23
- Published: 2014-06-05
- Earliest claimed: 2010-05-07
- Assignees: Evonik Stockhausen GmbH
- Applicants: Evonik Stockhausen, LLC
- Inventors: Gonglu Tian; David L. Bergman, JR.; Yaru Shi
- Web page: https://patentgrep.com/patent/US20140155259A1

## CPC

- B01J 20/26: Synthetic macromolecular compounds
- A61L 15/26: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)}
- C08F 220/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
- C08F 230/085: {the monomer being a polymerisable silane, e.g. (meth)acryloyloxy trialkoxy silanes or vinyl trialkoxysilanes}
- Y10T 428/249991: Synthetic resin or natural rubbers
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to a particulate superabsorbent polymer comprising a monomer and an internal crosslinker agent wherein the particulate superabsorbent polymer has a Centrifuge Retention Capacity Increase of 2 g/g or more as set forth herein in the Centrifuge Retention Capacity Increase Test. The present invention further relates to a superabsorbent polymer comprising an internal crosslinker agent comprising a silane compound comprising at least one vinyl group or one allyl group attached to a silicon atom, and at least one Si—O bond. The present invention further relates to an absorbent article that includes such particulate superabsorbent polymers.

## Claims

### Claim at position 1

1-56. (canceled)

### Claim 57

A superabsorbent polymer comprising a polymerized monomer selected from an ethylenically unsaturated carboxylic acid, ethylenically unsaturated carboxylic acid anhydride, salts or derivatives thereof, and an internal crosslinker agent comprising a silane compound comprising at least one vinyl group or allyl group and at least one Si—O bond, wherein the vinyl group or allyl group is directly attached to a silicon atom, wherein the superabsorbent polymer composition is a particulate superabsorbent composition and having a Vortex time of from about 20 to about 180 sec.

### Claim 58 (depends on 57)

The particulate superabsorbent polymer of claim 57, wherein the particulate superabsorbent polymer has a Centrifuge Retention Capacity of from about 25 g/g to about 55 g/g as set forth herein in the Centrifuge Retention Capacity Test and having a Vortex time of from about 20 to about 60 sec.

### Claim 59 (depends on 57)

The particulate superabsorbent polymer of claim 57, wherein the particulate superabsorbent polymer has a Absorbency Under Load at 0.9 psi of about 15 g/g to about 25 g/g as set forth herein in the Absorbency Under Load at 0.9 psi Test.

### Claim 60 (depends on 57)

The particulate superabsorbent polymer of claim 57 having a Gel Bed Permeability of from about 10×10−8 cm2 to about 300×10−8 cm2 as set forth herein in the Gel Bed Permeability Test.

### Claim 61 (depends on 57)

The particulate superabsorbent polymer of claim 57, wherein said silane compound is selected from one of the following
wherein
R1 represents C2 to C3 alkenyl,
R2 represents H, C1 to C4 alkyl, C2 to C5 alkenyl, C6 to C8 aryl, C2 to C5 carbonyl,
R3 represents H, C1 to C4 alkyl, C6 to C8 aryl,
R4 and R5 independently represent H, C1 to C4 alkyl, C6 to C8 aryl,
m represents an integer of from 1 to 2,
n represents an integer of from 2 to 3,
l represents an integer of from 0 to 1,
m+n+1=4,
x represents an integer larger than 1, and
y represents an integer of 0 or larger than 0.

### Claim 62 (depends on 61)

The particulate superabsorbent polymer according to claim 61, wherein said silane compound is selected from vinyltriisopropenoxy silane, vinyltriacetoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, diethoxymethylvinyl silane, and polysiloxane comprising at least two vinyl groups.

### Claim 63

A particulate superabsorbent polymer composition comprising a superabsorbent polymer comprising:
a) at least one monomer selected from an ethylenically unsaturated carboxylic acid, ethylenically unsaturated carboxylic acid anhydride, salts or derivatives thereof based on the superabsorbent polymer;
b) from about 0.001% by weight to about 5% by weight of a first internal crosslinking agent and second internal crosslinking agent, based on the monomer of a) wherein the first internal crosslinking agent comprises a silane compound comprising at least one vinyl group or allyl group and at least one Si—O bond wherein the vinyl group or allyl group is directly attached to a silicon atom; and
c) a salt forming cation wherein the superabsorbent polymer has a degree of neutralization of greater than about 25%;
wherein elements a), b) and c) are polymerized into a crosslinked hydrogel, which is then prepared into superabsorbent polymer particles; and the particulate superabsorbent polymer composition further comprises a surface coating comprising ethylene carbonate, aluminum sulfate and maleated polypropylene, wherein said particulate superabsorbent polymer composition has a Centrifuge Retention Capacity of from 25 g/g to about 55 g/g as set forth herein in the Centrifuge Retention Capacity Test and having a Vortex time of from about 20 to about 180 sec.

### Claim 64 (depends on 63)

The particulate superabsorbent polymer composition of claim 63, wherein said silane compound is selected from one of the following
wherein
R1 represents C2 to C3 alkenyl,
R2 represents H, C1 to C4 alkyl, C2 to C5 alkenyl, C6 to C8 aryl, C2 to C5 carbonyl,
R3 represents H, C1 to C4 alkyl, C6 to C8 aryl,
R4 and R5 independently represent H, C1 to C4 alkyl, C6 to C8 aryl,
m represents an integer of from 1 to 2,
n represents an integer of from 2 to 3,
l represents an integer of from 0 to 1,
m+n+1=4,
x represents an integer larger than 1, and
y represents an integer of 0 or larger than 0.

### Claim 65 (depends on 64)

The particulate superabsorbent polymer composition according to claim 64, wherein said silane compound is selected from vinyltriisopropenoxy silane, vinyltriacetoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, diethoxymethylvinyl silane, and polysiloxane comprising at least two vinyl groups.

### Claim 66 (depends on 63)

The particulate superabsorbent polymer composition of claim 63, having a Gel Bed Permeability of from about 50×10−8 cm2 to about 300×10−8 cm2 as set forth herein in the Gel Bed Permeability Test.

### Claim 67

A particulate superabsorbent polymer comprising a polymerized monomer selected from an ethylenically unsaturated carboxylic acid, ethylenically unsaturated carboxylic acid anhydride, salts or derivatives thereof, and an internal crosslinker agent comprising a silane compound comprising at least one or allyl group and at least one Si—O bond, wherein the vinyl group or allyl group is directly attached to a silicon atom, wherein the superabsorbent polymer composition is a particulate superabsorbent composition and the particulate superabsorbent polymer surface treated with an inorganic salt.

### Claim 68 (depends on 67)

The particulate superabsorbent polymer of claim 67, wherein the particulate superabsorbent polymer has a Centrifuge Retention Capacity of from about 25 g/g to about 55 g/g as set forth herein in the Centrifuge Retention Capacity Test and having a Vortex time of from about 20 to about 60 sec.

### Claim 69 (depends on 67)

The particulate superabsorbent polymer of claim 67, wherein the particulate superabsorbent polymer has a Absorbency Under Load at 0.9 psi of about 15 g/g to about 25 g/g as set forth herein in the Absorbency Under Load at 0.9 psi Test.

### Claim 70 (depends on 67)

The particulate superabsorbent polymer of claim 67 having a Gel Bed Permeability of from about 10×10−8 cm2 to about 300×10−8 cm2 as set forth herein in the Gel Bed Permeability Test.

### Claim 71 (depends on 67)

The particulate superabsorbent polymer of claim 67, wherein said silane compound is selected from one of the following
wherein
R1 represents C2 to C3 alkenyl,
R2 represents H, C1 to C4 alkyl, C2 to C5 alkenyl, C6 to C8 aryl, C2 to C5 carbonyl,
R3 represents H, C1 to C4 alkyl, C6 to C8 aryl,
R4 and R5 independently represent H, C1 to C4 alkyl, C6 to C8 aryl,
m represents an integer of from 1 to 2,
n represents an integer of from 2 to 3,
l represents an integer of from 0 to 1,
m+n+1=4,
x represents an integer larger than 1, and
y represents an integer of 0 or larger than 0.

### Claim 72 (depends on 71)

The particulate superabsorbent polymer according to claim 71 wherein said silane compound is selected from vinyltriisopropenoxy silane, vinyltriacetoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, diethoxymethylvinyl silane, and polysiloxane comprising at least two vinyl groups.

### Claim 73

A particulate superabsorbent polymer composition comprising a superabsorbent polymer comprising:
a) at least one monomer selected from an ethylenically unsaturated carboxylic acid, ethylenically unsaturated carboxylic acid anhydride, salts or derivatives thereof based on the superabsorbent polymer;
b) from about 0.001% by weight to about 5% by weight of a first internal crosslinking agent and second internal crosslinking agent, based on the monomer of a) wherein the first internal crosslinking agent comprises a silane compound comprising at least one vinyl group or allyl group and at least one Si—O bond wherein the vinyl group or allyl group is directly attached to a silicon atom; and
c) a salt forming cation wherein the superabsorbent polymer has a degree of neutralization of greater than about 25%;
wherein elements a), b) and c) are polymerized into a crosslinked hydrogel, which is then prepared into superabsorbent polymer particles; and the particulate superabsorbent polymer composition further comprises a surface coating comprising ethylene carbonate, aluminum sulfate and maleated polypropylene, wherein said particulate superabsorbent polymer composition has a Centrifuge Retention Capacity of from 25 g/g to about 55 g/g as set forth herein in the Centrifuge Retention Capacity Test and having a Vortex time of from about 20 to about 180 sec.

### Claim 74 (depends on 63)

The particulate superabsorbent polymer composition of claim 63, wherein said silane compound is selected from one of the following
wherein
R1 represents C2 to C3 alkenyl,
R2 represents H, C1 to C4 alkyl, C2 to C5 alkenyl, C6 to C8 aryl, C2 to C5 carbonyl,
R3 represents H, C1 to C4 alkyl, C6 to C8 aryl,
R4 and R5 independently represent H, C1 to C4 alkyl, C6 to C8 aryl,
m represents an integer of from 1 to 2,
n represents an integer of from 2 to 3,
l represents an integer of from 0 to 1,
m+n+1=4,
x represents an integer larger than 1, and
y represents an integer of 0 or larger than 0.

### Claim 75 (depends on 64)

The particulate superabsorbent polymer composition according to claim 64, wherein said silane compound is selected from vinyltriisopropenoxy silane, vinyltriacetoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, diethoxymethylvinyl silane, and polysiloxane comprising at least two vinyl groups.

### Claim 76 (depends on 63)

The particulate superabsorbent polymer composition of claim 63 having a Gel Bed Permeability of from about 50×10−8 cm2 to about 300×10−8 cm2 as set forth herein in the Gel Bed Permeability Test and having a Vortex time of from about 20 to about 180 sec.